FIGURE 4-20 Approximate daily sweating rates as a function of dry-bulb temperature and level of physical activity derived from modeling available data. The hatched area indicates the ≈ 1 L minimal water requirements as described in Table 4-2. The y-axis represents the predicted water requirements that increase because of increased sweat losses to enable thermoregulation. The x-axis is the average daytime dry bulb temperature. “Very active” is equivalent to approximately 3,600 total kcal/ day of energy expenditure, “active” is equivalent to approximately 2,900 total kcal/ day of energy expenditure, “low active” is equivalent to approximately 2,400 total kcal/day of energy expenditure, and “sedentary” is equivalent to approximately 1,900 total kcal/day of energy expenditure, categories identified in estimates of energy expenditure (IOM, 2002/2005). The model used to develop this graph is further explained in Appendix C.

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